Network tool
Subnet Calculator
Compute network, broadcast, and host ranges from any CIDR.
Enter an IPv4 address with prefix length, e.g. , , , ,
Frequently asked questions
What is a /24 subnet and how many hosts does it support?
A /24 subnet (subnet mask 255.255.255.0) provides 256 total IP addresses. Two are reserved — the network address (e.g. 192.168.1.0) and the broadcast address (e.g. 192.168.1.255) — leaving 254 usable host addresses. /24 subnets are the most common choice for small office LANs. For larger offices, consider /23 (510 usable hosts) or segment with VLANs.
How do I choose the right subnet size for my office network?
Start by counting the maximum number of devices that will be on the network — including workstations, phones, printers, IoT devices, and servers — and add 25–50% growth headroom. Choose the smallest CIDR block that comfortably fits that count. For most offices under 200 devices, a /24 (254 hosts) is standard. Separate voice, data, IoT, and management traffic into VLANs with their own subnets for security and performance, even if each subnet is small.
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